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Potential for cross-site scripting in PostHog-js

Moderate severity GitHub Reviewed Published May 22, 2023 in PostHog/posthog-js • Updated Nov 12, 2023

Package

npm posthog-js (npm)

Affected versions

< 1.57.2

Patched versions

1.57.2

Description

Impact

Potential for cross-site scripting in posthog-js.

Patches

The problem has been patched in posthog-js version 1.57.2.

Workarounds

  • This isn't an issue for sites that have a Content Security Policy in place.
  • Using the HTML tracking snippet on PostHog Cloud always guarantees the latest version of the library – in that case no action is required to upgrade to the patched version.

References

We will publish details of the vulnerability in 30 days as per our security policy.

References

@timgl timgl published to PostHog/posthog-js May 22, 2023
Published to the GitHub Advisory Database May 22, 2023
Reviewed May 22, 2023
Published by the National Vulnerability Database May 27, 2023
Last updated Nov 12, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS score

Exploit Prediction Scoring System (EPSS)

This score estimates the probability of this vulnerability being exploited within the next 30 days. Data provided by FIRST.
(65th percentile)

Weaknesses

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Learn more on MITRE.

CVE ID

CVE-2023-32325

GHSA ID

GHSA-8775-5hwv-wr6v

Source code

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